The Role of the Triangle
While there are many jokes about the triangle and its players, it can have a fantastic effect in an orchestration. Apart from the single hits that are very often used as comedy moments or for pointillistic highlights, especially the roll on the triangle can add an amazing high sparkle on top of chords and notes that subjectively highten their intensity.
The triangle usually has no problem cutting even through the thickest orchestration (because it has a lot of really high frequencies) and placing such a triangle roll on a final tutti chord can give the extra sparkle and brilliance. As with all special devices the magic lies in the dosage. Putting it on every suspending tutti chord will become annoying. So save it up for the really important moments.